33128732 has 36 divisors (see below), whose sum is σ = 71756496. Its totient is φ = 13104000.

The previous prime is 33128731. The next prime is 33128747. The reversal of 33128732 is 23782133.

It is a junction number, because it is equal to n+sod(n) for n = 33128695 and 33128704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33128731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1232 + ... + 8232.

It is an arithmetic number, because the mean of its divisors is an integer number (1993236).

Almost surely, 2^33128732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33128732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35878248).

33128732 is an abundant number, since it is smaller than the sum of its proper divisors (38627764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33128732 is a wasteful number, since it uses less digits than its factorization.

33128732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7038 (or 7023 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

The square root of 33128732 is about 5755.7564229213. The cubic root of 33128732 is about 321.1699749698.

The spelling of 33128732 in words is "thirty-three million, one hundred twenty-eight thousand, seven hundred thirty-two".